Faint notes on bombards and building, untranscribed

The e-Leo record for this verso is caption-only, noting that the leaf was invisible before restoration and was thought devoid of writing and drawings. In fact the restored sheet bears extensive script laid out in several columns and a faint geometric figure at the right edge, none of which is transcribed here. The Biblioteca Ambrosiana's scholarly tags associate the sheet with bombards and with architectural notes, including lime mortar (latte e calcina). Further untranscribed text is present on the leaf.